Excavating-dipper tooth.



W. LRMAHON.

EXGM/"AING DIPPBR TOOTH. APPLICATION FILED JULY 15,/1911.

Patented 1Wa11231915- IAM LE.' M 1:. 0N, OIF ANN .am l: MICHIGAN.

CAVATINGHDIFPEE, TOOTH.

Application filed July 15, 1911.

rllhe invention relates to excavating or.

thereof; Fig. 3 is a plan of the forward end of the tooth base with the point removed; Fig. 4 is a longitudinal section through the detachable point; and Fig. 5 is a rear elevation thereof.

My improved construction of tooth is applicable to any standard construction of excavating di pper and may be arranged thereon in the usual manner. The drawings therefore show only the detached tooth which is constructed as follows: A is the shank porn tion or tooth base which is adapted to t over the bottom of the dipper, and B is an underlip ort-ion for engaging the under face of said ottom. C is the point or tooth proper which projects forward beyond the edge of the clipper bottom and forms a chisel edge for penetrating the material to be eX cavated.

lt is obvious that the point of the tooth is subject to continual wear which necessitates sharpening or renewing from time to time. At the same time the stresses to which it is subjected are such that where formed of a separate member from the tooth base it is difficult to obtain the requisite strength and rigidity. rlhus there are -vertical stresses Specification of Letters Patent.

Patented Mar. 23, 1MM..

Serial No. 638,706.

which tend to break od the point from its base, and lateral stresses which tend to defleet it to one side or the other.

My improved construction is designed to vprovide an engagement between the tooth base A and a detachable tooth point C which will provide for the various stresses to which the point is subjected, imparting substantially the same rigidity tothe tooth as in the integral construction.

In detail, the forward end or portion E of the tooth base A is of a tapering or V- form adapted to engage a correspondingly fashioned recess in the tooth point C. At the end of the portion E is a dowel shaped projection F engaging a socket G in the .tooth point C, while the portions of said tooth point upon opposite sides of the llshaped recess are provided with dowel shaped projections H which engage recesses I in the tooth base. Thus the seat for the tooth point is provided with a three-point bearing, the dowel shaped projections H serving to hold the inner end of the tooth point both from lateral and from spreading movement, and the dowel shaped projection F also holding said point from displacement laterally Furthermore, the tapering seat formed by the ll-shaped portion lE of the tooth base will take up all lost motion and will impart rigidity to the structure.

For holding the parts together the engaging portions of the tooth point and tooth base are provided with a vertically extending recess therethrough, through which a bolt J is passed, the ends of said recess being enlarged at K and L to receive the head and nut of the bolt.

A structure formed as described is one which permits of renewing the tooth point whenever necessary, it being merely necessary to disengage the bolt J which permits of disengaging the point and replacing by another. When secured in position, and during the operation of the dipper the tooth point is rigidly held.

What ll claim as my invention is:

An excavating tooth, comprising a base andv n point, and means establishing the same in a rigid relation, the base having a tapering portion tting within aI similarly In testimony whereof I aiiix my signature shaped socket in the point, the point being in presence of two witnesses.

formed with opposite tongues within the socket, which are received by grooves in opposite faces of the tapering portion of the bese, a dowel being projected rearwardly Witnesses: from each tongue and received by a socket W. J. BELKNAP, in the base, said dowels being parallel. JAMES P. BARRY.

WILLIAM LE. MAHON. 

